Close-range Photogrammetry for Surface Thermal Deformation of Large-scale Deployable Antennas

doi:10.3901/JME.2020.11.065

Abstract

Abstract: In order to ensure the on-orbit performance of high-precision deployable antennas and verify the reliability of design, materials and processes, a digital close-range photogrammetry technique is proposed to test the thermal deformation of the deployable antenna surface in the ground simulation environment. Two methods including artificial and auto were used to measure the antenna. Several corrective actions were proposed and made, such as camera protection can, low-high temperature targets and extremely low expansion glass scale-bar. The test results show that the surface precision of the antenna varies with the change of temperature, and the variation law of the three measurement cycles is consistent. The surface precision of the antenna is the worst at the temperature node of +60 ℃, and the maximum value of the root mean square (RMS) reaches 0.220 mm (manual measurement). However, it also meets the technical design requirements of antenna surface precision of less than 0.5 mm. For the temperature difference of 40 ℃ and 80 ℃, the RMS of the surface deformation of the antenna measured manually is 0.045 mm and 0.083 mm, respectively, which also meets the requirements of the technical design index 0.100 mm and 0.150 mm for the surface deformation of the antenna. At the same time, it is verified that the measurement results of automatic measurement and manual measurement are consistent, both of them can meet the requirements of measurement technical design, and provide an extensible idea for the automation of high-low temperature measurement experiments.

Key words: close-range photogrammetry, surface thermal deformation, deployable antenna, high-low temperature

CLC Number:

P234

HUANG Guiping, MA Kaifeng, BAI Hongwu, MA Xiaofei, WANG Yong. Close-range Photogrammetry for Surface Thermal Deformation of Large-scale Deployable Antennas[J]. Journal of Mechanical Engineering, 2020, 56(11): 65-71.

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